tweak(game/fivem/loadscreen): Initialize the player for RAGE with manual shutdown

[TheGamerzs]

Goal of this PR

Sets the Players Ped to 0,0,0; this makes RAGE render/activate game mechanics (Map, Entities, Entity dependent natives, UI).
Also, it removes setting the doSetup condition, as this code is unrelated and not reachable via manual shutdown.

How is this PR achieving the goal

Sets the Players Ped to 0,0,0
Remove loadsThread.doSetup = true;, in ShutdownLoadingScreenNui

This PR applies to the following area(s)

FiveM

Successfully tested on

Game builds: 1, 2060, 3258

Platforms: Windows Client

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Additional Information

Current (Only distant cars, water, weather, and time are present & entities are static if spawned):

New (Playable game state):

Most people don't see this behaviour, as spawn managers/menus set the coords.

[dalekenium-cfx]

No major complaints. I approve.

[TheGamerzs]

The only reason he's standing is the interior or whatever is at 0,0,0 on build 2060 and later.
On builds 1 and 1604 he's falling.

Should the docs be updated to reflect this change?
I didn't freeze him, as this would've broken backwards compatibility.